Structure of the jetty with fixed machinery and moving ship is composed by unloading platform,ship moving platform and fender pile in the front of the platform.Among them,the fender piles bear ship collision force during berthing and transmit it to the rear rubber fender and wharf platform.The structural stress form is complex,which is the key to wharf design.There is no corresponding calculation method in the existing codes and manuals.In view of this problem,the design features of fender piles are emphatically discussed.By simplifying the fender compression process into ideal elastic-plastic deformation and dividing the berthing process into three stages,the force state of fender piles is analyzed respectively.Based on the principle of energy conservation law,the equations of force,displacement and energy absorption of the fender pile system are established.A set of simplified calculation method is summarized and verified by practical projects.